Pump



1 ford ungngiem;

" res1sting,with"a, `substramsa thef niqnS-@ndrffor `verste direction .whe

xis. "d posed s` determined member 4' axially of the tube 4, the member 4' comprising both a closure for the outer end of the tube and an adjustable abutment for the outer end of the spring G. As previously stated,

the axis of the pivot 3 which connects the enlarged end of tubular member 4 to the cam is disposed closer to the pump axis than are the axes of the several pistons I, the axis of pivot 3 being preferably as .close as possible tothe pump axis. This arrangement is highly advan-V tageous In the rst place, it insures improved pump operation, as compared with previous pumps of this general type and,` in addition, it permits a better distribution of the'stresses in the pump and also permits the use of a much lighter spring than would otherwise be required.

According to a further feature of the invention the pusher or piston-like element 5 is provided vwith one or more apertures or channels 1 connecting the space within the tubular member 4 with the space within the housingV which encloses the cam and pistons. The pusher or piston-like member 5, therefore, operates as a dash pot and serves to dampen vibration of the cam 2, the dash pot or vibration damping action of member v5 being particularlyY helpful when the pump includes but a relatively small number of pistons, in which case the force applied against the cam will fluctuate.

Obviously the invention is not limited to the embodiment described and,illustrated, which embodiment has been set forth by way of A'example only.

Having thus described the invention, what is claimed as new and desired tobe secured by Letters Patent is:

1. In a wabble plate pump, in combination, a plurality of pump cylinders disposed in a circular series about, and substantially equidistantly from, a, pump axis, each cylinder having an associated piston and the several pistons being cam and member arer constrained to rotate .tol gether and the cam is-supported for rocking movement about an axis. disposed in'.a plane normal to said pump axis and tangent to acir'cle in said plane which is centered on said pump the radius of said circle being less than the radius of a cylinder which includes the piston axes, and means disposed within and carrledby vsaid elon-V gated'tubular. member forjresisting with asubstantially constant force rocking movement of the cam .produced by increase in the resultant pressure exerted on 'thercam by the pistons, and for rocking said cam inthe reverse direction when said resultant pressure of the pistons de- Greases.

s. ma wabbie' pitite pump, in combination, a v

pluralityfof pump cylndersfdisposed in'` a circular series about,'.and substantially equidistantly from,

- a pump axis, .each cylinder havingy an'associated nr a piston andthe several pistons being'v disposed inV parallel relationship to each otherjandfto said axis, a' cam disposedV transversely ofjsaidaxis and so as to engage and act upon the heads of the said pistons, a camsuppo'rtingf member disposed adjacent said cam, said member and said series of cylinders being relativel'yfrevoluble about'said axis, means pivotally connectingsaid member and cam whereby the .member Aand'cam arejcon- 'strained to rotateftogether and the cam is supported for rocking `movement about an axis disposed in a plane normal to the pump axisl and spaced laterally of said pump axis, and means indisposed in parallel relationship to eachother and to said axis; a cam disposed transversely of said axis and so as to engage and act upon the heads of the said pistons, a cam supporting member disposed adjacent said cam, said member and said series of cylinders. being relatively revoluble about said axis, means pivotally connecting said member and cam whereby the cam and member are constrained to rotate together and the cam is supported for rocking movement about an axis disposed ina plane normal to said pump axis and tangent to a circle in said plane of a cylinder which includes the piston axes, and

-means for resisting with a substantially constant force rocking movement of the carnproduced by increase in the resultant pressure exerted on the cam by the pistons, and for rocking said cam I in the reverse direction when said resultant'pressure of the pistons decreases.

2. In a wabble plate pump, in combination, a

lplurality of pump cylinders disposed in a circular series about, and substantially equidistantly from,

a pump axis, each cylinder having an associated piston and the several pistons being disposed in parallel relationship to each other and to said axis, a cam disposed transversely of said axis and so as to engage and act uponthe heads of the said pistons, an elongated tubular member the` axis of which is coincident with the pump axis and one end of which is adjacent said cam, said member being` rotatable about lsaid axis, means pivotally connecting said member and cam whereby the which is centered on said pump axis, the radius of said circle being less than the radius,

cluding a dash pot mounted on said member for l resisting, with a yieldablyresisting forcefrocking movement of the cam produced by increase in the n resultant pressure` exerted on the -cam by the pistons, and for rocking said cam in the reverse direction when said resultant' pressui'eofV the pistons decreases. ,Y

4. In e wabbie' platefpinp, Vmicomunthan, a

pivotally connecting the cam to the adjacent end l of said tubular member whereby thefcam and member :lare constrained to y'rotatetogether and the cam is rsupported for rocking movement about an axis disposed'iny a plane normalto the pump axis vand spaced laterally of said pump axis, a closure for that end of the tubular.v member which is remote from the' camfand-V means disposed within said tubular Vmemberr4 for resisting, withva substantially/ constant force, rocking movement of the cam produced'by increase in the resultant' pressure exerted on the cam'byfthe pistons and for rocking said cam in the reverse 'direction when vsaid resultant pressure' of the pistons decreases,V

said last mentioned means includingan-fapertured piston-like element slidablyditting-within that endof the tubular member-'adjacent the cam andv comprising'with f he'tubula'r member and its closure a dash pot, and

against said closure; 1

' f JEAN MERCIER. n.

, Y Y a spring. within. said tubularmember one endofA 'which bears against said piston-like element and "theiother 

